Bushing for automatic grinders



May 2,1 23. I 11,456,,M?

A. E. WHITE BUSHING FOR AUTOMATIC GRINDERS Filed Jan. 3, 1922 2 Sheets-Sheet 1 7 J/v YEA/mm fiLBERT f. WHITE Fm r 019M May 22, B923. HASGAW A. E. WHITE BUSHING FOR AUTOMATIC GRINDERS Filed J an. 5, 1922 2 Sheets-Sheet 2 [Iv VE/V T'Ofi HZBE/WE MW/ 7'5 Patented May 212., i923.

inset were ALBERT E. WHITE, OF EAU CLAIRE, WISCONSIN.

BUSHING FOR AUTOMATIC GRINDEBS.

Application filed January 3, 1922. Serial No. 526,761.

which revolves under the magazine and over the magnetic chuck, the disc wheel being provided with a plurality of openings into which the ring blanks drop from the magazine, one at'a time, and are carried over the magneticchuck to a position for grinding,

Here they are held by theforce of the chuck and revolved at a rapid rate within. the openings of the disc wheel. As the disc wheel operates in close proxim'ity to the magneticchuck, it is'necessary to make the wheel of brass or other soft metal, which is not susceptible to magnetic influence. In practice it has been found that the ring holders made of soft metal wear very fast through contact with the rough surface of rings which are revolved within the openings at a rapid rate and under pressure.

To overcome this difficulty, the general practice has been to insert a soft metal bushing not susceptible to magnetic influence within the openings of the disc wheel, but I have found this practice only obviates apart of the loss by rapid wear of the ring' openings through contact with the revolving rings, making it necessary to replace or renew the bushings frequently and thereby adding to the cost of maintenance of the inachine and consuming time in the changing of bushings.

Soft metal bushings having flat spring steel lining soldered on the inner surface have been used. It has been found, however, through practice, that linings made of steel or other metal, susceptible to magnetic influence, will become affected by proximity to the magnetic chuck and become magnetized, causing the rings to stick in the bushings and interfering with the success and speed of the grinding operation.

The object, therefore, of invention is to provide a lining for the ringbushings which will overcome the above descr ibeddifficulties and providea simple, comparatively inexpensive lining,easilyinserted and readjusted and readily removed for substitution or repairs;

A further"ob ect is to provide a lining adapted for bushlngs used in fimshin various other articlesas well as piston rings.

' Other objects of the invention will appear from the following'deta iled description.

In the accompanying drawings' 'for'ming part of this specification, V

Figure l is a plan view of a disc-wheel usedin an automatic piston ring grinder, showing my invention applied thereto, Figure 2 is a view partly in sectio 'ion the i '1 i v line 2-2 of Figure 1 Figure 3 is a detail sectional view, showmg the relative position 'o'f'the pistonri and the magnetic chuck,

Figure 4 is a plan view of a ring bushing, with" my improved lininglthere n removed from the disc-wheel,

Figure 5 is atransverse sectional view of the same, a Figures 6 and 7 are similar views, showing a modified form of the lining. I In the drawing, 2 represents the revolving disc-wheel of an automatic pistonring grinder in general use. 3 is a magazine wherein the piston-ring blanks 4: are placed, one uponthe other. This magazine is suspended, as indicated in Figure 2, so that the disc-wheel revolves beneathit and receives the piston rings one by' onedui'ing such revolution. The disc-wheel is usually provided with a series of openingsl5', four in number being shown in this particular discwheel, and in these openings a ring bushing 6 ismounted, usually [by threading theedge of the opening and the periphery ofthe ring. The pistonrings are delivered to the openings in the bushings as the' dis'c wheel revolves intermittently under themagazine.

Beneaththe disc-wheel isa magnetic chuck 7 of any ordinary'or preferred type, having the function usual in devices of this kindof holding the piston ring during the grinding operation, the ring restin 'u on the chuck and within the ring bushing 6," as indicated in Figure 8, beneaththe revolving grinding wheel 8 that is mounted to reciprocate over the chuck and engage theupper surface of the ring, the grinding operation continuing tentio n.

machine, The substitutionof a brass bushng forthesteel eliminates the objection of "magnetism, butI have found in ractic'e that such abushing is not durable. twears rapidly through contact with the piston ring and ence requires frequent renewal and at- To eliminate objection, I provide a v ring; lining.,9 composed preferably of a metalr known as stellite, a very hard, durable metal not. susceptible to magnetic inrecess; in the upper inner edge of the bushing, where will contact with the surface of the piston ring and protect the softer bushing from wearing contact there If with. This stellite ring, shown rectangu- 1a; in. cross section, fits snugly within the bushing, becoming practically an integral part thereof, but may be turned or rotated to present new wearing surfaces or removed whenever desired. for renewal or repairs, while the outer bushlng ring may be used indefinitely.

I, have found in practice that most of the wear on the lining is ordinarily confined to one spotwhen in a given position, consequently by rotating the lining and shifting its position in the bushing I am able to greatly increase its wea-ring qualities and length of use. 7

In Figures 4 and 51 have 'sho-wna similar lining ll-made: of the same material but a,

little thinner and Wider, though correspondingv in its functions to the lining shown .in Figure 3. v I

. I .have found" that stellite is particularly adapted for my purpose, as it is not influenced by the magnetic force of the chuck and being extremely hard, as stated, is therefore better adapted for use as a lining than any other metalI have found. It also makes an economical lining, as its wearing qualities eliminate expense of frequent renewal and loss of time in changlng the lining. I

In Figure 6 I have shown a modified construction that may be used, which consists in providing an annular V-shaped' recess 12 ,in the inner edge of the bushing and mountingtherei'n a lining 13, preferably of round spring brass wires having suiiicient tension to grip the walls of the recess and present an inner wearingsurface for contact with the ring during the grmding operation. This spring brass ring may be turned in 1ts seat, so as to present anew wearing point, a rotary magnetic chuck, a disc-wheel hav-" fluence,:arranged to fit within an annular or be readily removed at any time for sub stitution or repairs and will not'be affected by magnetism through proximity to the chuck. I

In Figure? I have shown another modification, which consists in providing an annu- 'lar V-s-haped recess 14 in the upper inner edge of the bushing and in this recess I arrange a similar wire lining 15, made preferably of round spring steel wire of small gauge, which will be more durable than the brasslining shown in Figure 6. The magnetic influence of the chuck on thelining ring will be comparatively slight, as it is, small in cross sectional area. and does not come in direct contact with the face of the chuck, but an air gap will be provided be- :tween the chuck and the ring, due to the placing of, the ringin the upper edge of the bushing, as described. Moreover, the steel lining body being comparatively small,does

not present sufficient surface 4 for contact with 'the piston ring to interfere withjthe grinding operation, even though the lining shouldbecome slightly {magnetized I have found from experience that it is practicable to equip" bushings with wire linings in this way, but I prefer to use the'flstellite lining shown in the"previous figures, for

the reasons stated. I

It is apparent, that other articles than rings might be ground.

I claim as my invention:

1. A rindin a aratus includin a feed: mg and centeringdevice having a recessin whichthe article to be ground is seated, a bushing within said recess of non-magnetic hard metal, a rotary magnetic CllllCk'fOI' rotating the article in saidbushing, anda grinding device for the article.

2. A ringgrinding apparatus including a ring feeding and centering device havinga recess in which the ring to be ground is seated for rotation, a bushing within said recess of non-magnetic soft metal, and a lining of non-magnetic hard metal within the soft metal, a rotary magnetic chuck for rotating a ring in the bushing, and a grind ing device for the ring. l

3. A ring gri ding apparatus including a ring feeding device having a recess therein, a soft non-inagneticbushing in said recess'having an annular. recess on its interior and a stellite ring seated within said recess for contact with the work during the grinding'operation.

4L. The combination, with a disc wheel having opening therein, a grinder operating above said wheel a-rotary magnetic chuck beneath said wheel, and a'hard non-mag netic lining for said opening for contact with the. work-seated on said chuck.

a 5 In combination, in an automatic ring grinding machine a ring blank magazine,

mg a plurality of openings and mounted to revolve under said magazine and over said chuck, non-magnetic soft metal bushings mounted in said openings and having annular seats in their inner edges and stellite linings fitting said seats and mounted for rotary adjustment therein.

6. In combination, in an automatic grinding machine, a blank magazine, a rotary magnetic chuck, a disc-Wheel having a plu- 10 rality of openings and mounted to revolve under said magazine and over said chuck and stellit'e linings in the openings of said Wheel for contact with the Work.

In witness whereof, I have hereunto set no my hand this 27th day of December, 1921.

ALBERT E. WHITE. 

